Shank and bit punch



Sept. 7', 1926, 1,598,650

H. LEVINE 'SHANK AND BIT PUNCH Filed Dec; 17 1925 3 I INVENTORZ;

Patented Sept. 7, 1926.

umrsn srares Hyman LEVINE, or DENVER, cotonAno, nssienon TorivenasonL-eann coMrAnY,

OLE JERSEY. CIT-Y, NEW; JERSEY, A ,COREORATION 01 iv NEW/JERSEY.

SHANK Ann err PUNCH.

Application filed December This invention relates to shank and bitpunches for opening thebores of rock drills but more particularly tothat type of machine in which the punch pin is both hammered into andout of the drill steel. Punches of this type generally constitute partof rock drill sharpener outfits in mines, quarries. etc, and in commonwith the drill sharpeners are subjected to the maximum of hard'usage,often with the minimum of attention. Consequently, just as in the caseof the rock drill sharpener, two of the most important features in thedesign of a shank and bit punch must necessarily be simplicity andruggedness. The object of my in vention, therefore, is to provide apunch having a minimum of parts while at the same time it loses nothingin effectiveness.

The invention is shown in one of its pre ferred embodiments in theaccompanying dra ing, in which Figure 1 is a longitudinal sectionalelevation of the machine with the parts in po'-- sition for hammeringthe punch pin into the drill steel, and I Figure 2 is also alongitudinal sectional elevation of the machine with the parts inposition for hammering the punch pin out of the drill steel.

Referring to the drawings, the hammer cylinder A is mounted integrallywith the feed cylinder B upon a slide or guide C. In the feed cylinder Bthe piston D is adapted to reciprocate in such away as to move thehammer cylinder back and forth on the guide at the will of the operator.A suitable valve E is adapted to control the admission of pressure fluidto both the feed cylinder and the hammer cylinder. The drill steel F isclamped in a suitable vise Gr in tegral with the guide C in such a waythat proper alignment with the punch pin can be maintained. At the frontof this hammer cylinder A an anvil block H is held loosely within thefront head J, which in turn is adapted to move slidably within the boreof the cylinder. The punch pin K is held by some suitable means in theanvil block H.

A differential piston L is adapted to reciprocate within the cylinder A.At the back end of the cylinder A a back head 0 is provided with acylindrical portion adapted to fit slidably within a cylindrical hollowbore in the end of the cylinder.

17, 1925. Serial No. 76,104.

Through bolts P with shoulders Q are used to hold the front head J infixed relation with the back head 0. The porting in the cylinder is suchthat no valves are required and the hammer is adapted to reciprocatewith a uniform stroke. i

In Figure 1 the parts are so arranged that the front head assemblycontaining the anvil block is pushed into the cylinder until theabutments R make contact with the end of the cylinder S. As'a result thethrough bolts P hold the headO at an equivalent distance from the rearend T of the cylinder. In addition to this the anvil block H is forcedrearwardly within same time the piston L does not strike against thecylindrical abutment U since the back head 0 is pushed away from thecylinder by means of the through bolts P.

In Figure 2 the piston 'D in the feed cylinder B is forcingthe cylinderA away from the drill steel, and as a result the back head 0 with itscylindrical abutment U is forced against the rearend of the cylinder Aand by means of the through bolts P the front head assembly is forcedaway from the front end of the cylinder and the anvil block H is drawnforwardly in the front head J so that it does not project into thecylinder A. Thus, the piston L is in a position to deliver blows againstthe back head 0 through the abutmentU and these blows are transmitted bymeansof the side bolts P, the front head J and the anvil block H to thepunch pin K, tending to drive the punch pin out ofthe drill steel F. Thevalve assembly E is of any preferred type, such that motive fluid willbe admitted into the feed cylinder B to drive the cylinder forward or todrive it backward at the same time that motive fluid is admitted intothe cylinder to cause reciprocation of the ham the front head J andprojects within the inc ment U nor to the actual means shown forestablishing a fixed connection between the back head and the fronthead. My invention consists essentially in the idea of utiliz- Withinthe said cylinder a back cylinder ing a back head slidable within thecylinder as a means for receiving the hammer blows of thecylinder indriving out the punch pin.

I claim 1. A shank and bit punch for drill steels comprising a feedcylinder, a hammer cylinder, a reciprocating hammer piston within saidhammer cylinder, a front cylinder head, a cylindrical abutment on saidhead for reciprocation in the end of said hammer cylinder, an anvilblock loosely reciprocable in the said front cylinder head and adaptedto carry a punch pin, a rear cylinder head, a cylindrical abutment onsaid head adapted to reciprocate within the rear end of the cylinder andto receive blows from the hamhead, a cylindrical abutment integral withsaid back head for reciprocation within the rearward end of saidcylinder, and adapted to receive the blows of the piston directly underpredetermined conditions of penetration of the cylinder, side bolts forholding the said cylinder heads in fixed relation to each other butslidable relation to the said hammer cylinder, whereby the hammer pistonwill deliver blows of impact to the said anvil block to drive the punchpin into the steel, or will deliver blows of impact to the said abutmenton the back cylinder head for driving the said pin out of the steel.

8. In a shank and bit punch for drill steels, the combination of meansfor holding the drill steel, a hammer cylinder, a difierential hammerpiston, a movable front cylinder head with a cylindrical abutment forlimited reciprocation Within the front end of thecylinder, an anvilblock carried within the said cylinder head and reciprocable therein, apunch pin carried by the anvil block, a movable back cylinder head witha cylindrical abutment for limited reciprocation in the rear end of saidcylinder, adapted to receive the blows of the piston directly during itsmaximum penetration of the cylinder and means independent of thecylinder for holding the said cylinder heads in fixed relation each toeach, a feed cylinder and piston for holding the punch against the drillsteel and a single valve for motivating the said hammercylinder and thesaid feed cylinder.

In testimony whereof Ihave signedthis specification.

HYMAN LEVINE.

